Malicious PDF — malware analysis report

Static analysis result for SHA-256 c369f91e21991e80…

MALICIOUS

PDF

94.9 KB Created: 2021-07-02 10:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e92a5814ba7819b6746da334bc9e004b SHA-1: 41d10951375cb2771fb598018094175d23daebea SHA-256: c369f91e21991e80b777050bb32a34672f1c21db04829ec0dba43d6e79225fcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/l0ii0917760hfcnotpbudqe4p0/tobur.pdf In PDF document text
    • http://akicgiyim.com/userfiles/file/44375775873.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ul366vt6mvfovjsfgm71mulpud/61529353739.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/22095698058.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/467055cb2fb88f17ed3dc227a3234256/88209984772.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/vutudukaxorodaxe.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/3980788063.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc69221dd---pipugavurisitojof.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wuwezeduresos.pdfIn PDF document text
    • http://chinalabware.es/d/files/pogazamewiru.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/sinuvimifeluvuvevawolozut.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b17eca472---33138056630.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/joditazuvipe.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/62862608427.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/dumerel.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ead29066f379a3fdc0706c589fa993d9/19414317337.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d3976303---31057067378.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773edc8fa7b---53236008791.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee9800953---jefawuredakuwasapube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+breed+a+ragnarok+dragon+in+dragonvalePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 19584 bytes
SHA-256: 29399a1041d491443f24601b0dbf527cba75bf03ec1ca9d2f734a552e429c1aa
font_01_sfnt_off00013c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15471 10628 bytes
SHA-256: 93c94e44028e5c06d80a4fb8525ab45a404b97ccc7a9c405044a235d17ee88f6